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引用次数: 0
摘要
通过实验研究了松木在模式 I 载荷作用下的抗断裂性能，包括不同的裂纹平面方向和平行于纵向单元的裂纹扩展方向。使用数字图像相关系统对双悬臂梁进行了实验，以评估裂纹尖端张开位移。基于顺应性的梁法用于确定不同裂缝长度下的能量释放率。提出了将裂纹扩展分解为前峰和后峰扩展的方法，以找出松木中各个增韧机制的断裂能量贡献。实验中测得的内聚强度通过与松木单独测试获得的拉伸强度进行比较得到了证实。评估断裂过程区的分析模型用于验证实验结果。通过断裂表面的 X 射线显微层析成像，解释了不同裂纹扩展系统中断裂能量值之间的差异。
The effect of crack orientation on the mode I fracture resistance of pinewood
The fracture resistance of pinewood under mode I loading is investigated experimentally for different crack plane orientations and the crack propagation direction parallel to longitudinal cells. Experiments are conducted on double cantilever beams using a digital image correlation system to evaluate the crack tip opening displacement. The compliance based beam method is used to determine the energy release rate at various crack lengths. The decomposition of crack propagation into the pre-peak and post-peak propagations is proposed to find the fracture energy contributions from individual toughening mechanisms in pinewood. The cohesive strengths measured in the experiments are confirmed by comparison with the tensile strengths obtained from separate tests performed on pinewood. An analytical model for evaluating the fracture process zone is used to validate the experimental results. The difference between the fracture energy values in different crack propagation systems is explained by using X-ray microtomography images of the fracture surfaces.
期刊介绍：
The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications.
The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged.
In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.
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